[#boost-urls-default_port]
= xref:boost/urls/default_port.adoc[boost::urls::default_port]
:relfileprefix: ../../
:mrdocs:

Return the default port for a known scheme

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/scheme.hpp#L174[boost/url/scheme.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::uint16_t
default_port(xref:boost/urls/scheme.adoc[scheme] s) noexcept;
----

== Description

This function returns the default port for the known schemes. If the value does not represent a known scheme or the scheme does not represent a protocol, the function returns zero.

The following ports are returned by the function:

* `scheme::ftp` = 21
* `scheme::http`, `scheme::ws` = 80
* `scheme::https`, `scheme::wss` = 443

== Return Value

An integer with the default port number

== Parameters

[cols=2]
|===
| Name
| Description
| *s*
| The known scheme constant
|===


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